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* Zone trim air modulating valve driver.
NOTE: Failure of the temperature selector causes a default to
a 75F (24C) set point.
These failures cause K11 passenger INOP relay to relax and
command the passenger zone trim air modulating valve to
close.
AIR CONDITIONING - TEMPERATURE CONTROL - PASSENGER COMPARTMENT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 72
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-807
AIR CONDITIONING - TEMPERATURE CONTROL - PASSENGER COMPARTMENT - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - PASSENGER COMPARTMENT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 73
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-807
Purpose
The duct overheat switch sends an overheat signal to close the
trim air modulating valve. Also, it sends a signal to turn on the
ZONE TEMP light.
Location
The flight compartment duct overheat switch is in the EE
compartment on the left side adjacent to the E2 rack.
There is a forward and an aft passenger cabin duct overheat
switch. The forward cabin duct overheat switch is in the
overhead duct forward of the left forward riser. The aft
passenger cabin duct overheat switch is in the overhead duct
aft of the right aft riser.
Physical Description
The duct overheat switch is vapor pressure actuated switch.
The duct overheat switch has these parts:
* Probe
* Electrical connector
Functional Description
When the temperature in the duct is 190F (88C), a liquid in the
probe creates a vapor. The vapor in the probe operates a spring
that operates an electrical switch. This energizes a relay in the
air conditioning accessory unit. The relay turns on the ZONE
TEMP light and closes the trim air modulating valve.
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 74
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-823
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 75
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-823
General
The airplane has two cooling packs that convert hot, high
pressure air from the engine compressor into cool, low
pressure air for the cabin areas. The packs are controlled by
two integrated pack/zone cabin temperature controllers (CTCs).
Each CTC has a digital primary channel to control its associated
cooling pack, and an analog channel that provides backup
control for the opposite cooling pack.
The CTCs also control the trim air system that allows
independent temperature control of the flight compartment
and passenger cabin. The temperature control system provides
independent temperature control in each of these three zones:
* Control Cabin
* Forward Passenger Cabin
* Aft Passenger Cabin.
The CTCs control the cooling pack outlet temperature to match
the zone with the lowest temperature requirement and the trim
air system adds heat to the other zones to meet their
temperature requirement.
The right CTC provides temperature control for the forward
passenger zone and primary temperature control for the flight
compartment zone. The left CTC provides temperature control
for the aft passenger zone and standby temperature control for
the flight compartment zone.
The temperature control system operation is automatic,
including automatic reconfiguration of standby and backup
functions to maintain temperature control during failure
conditions.
Control
The temperature controls and indications for the flight
compartment (CONT CAB), forward passenger compartment
(FWD CAB), and the aft passenger compartment (AFT CAB) are
located on the cabin temperature control panel, P5.
Three temperature selector switches allow different
temperature settings for each zone. The temperature signal
from the selector switch goes to the CTC. The CTC compares
the requested zone temperature setting to the actual
temperature values from the zone, duct and pack temperature
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